barlow



(No Model.) 2 Sheets-Sheet 1.

0. 0. BARLOW.

Y MACHINE ROCK DRILL.

No. 3}6,10'7. Patented Apr. 21,Y 1885.

(No Model.)

2 Sheets-Sheet 2.

e. o. 13A-BLOW.

MACHINE ROCK DRILL.

No.` 316,107. Patented Apr. 21, 1885.

UNITED STATES "PATENT OFFICE.

CHARLES O. BARLOW, OF NEVADA` CITY, CALIFORNIA, ASSIGNOR, BY DIRECT ANDMESNE ASSIGNMENTS, OF THREE-FOURTHS TO GEORGE T. EMERY AND JOSEPH W.SPRAGUE, OF SAME PLACE, AND RICHARD H.

LANE, or NEW YORK, N. Y..

MACHINE ROCK-DRILL.

SPECIFICATION forming part of Letters IPatent'. No. 316.107, dated Apri121, 1885.

' Annina/tion filed June i7,` 1884. (No model.) V

.To aZZ whom it may concern.:

Be it known that I, CHARLEs O. BARLow, of Nevada City, county of Nevada,and State of. California, have invented-an Improvement .rock again,mechanism for rotating it, and

mechanism for delivering the blow.

It consists, further, in the various devices, hereinafter explained, bywhich these results are effected, and also in a device by which theframe or bar carrying the drill and driving mechanism is detached fromthe feed-screw and adapted to be moved back rapidly.

The object of my invention will be made clear in the course ofthefollowing description.

, Referring to the accompanying drawings, Figure 1 is a perspective Viewof my drill. Fig. 2 is a-vertical longitudinal section of thedrill-arbor and its parts, showing the drill-bit in elevation. Fig. 3 isa perspective view of the cross-bar, showing the addition, in somecases,of a second drill-arbor. Fig. etis a perspective view of thesecond arbor, its bearing or seat being open. Fig.-5 is a longitudinalsection of same. Fig. 6 is a perspective view of the two-part chuck S.Fig. 7 is a longitudinal section of the detachable nut c on feed-117,516, led January 14, 18S/Land therefore 45 in referring to thegeneral construction of parts Ido not intendto do sowith thatparticularity which would be necessary if I herein for the first timeclaimed novelty forthem.

A is thesupporting-column. B is the crossbar secured `to said column byaboxing, a, whereby the cross-bar is adapted to be adj usted verticallyand to any desired inclination.

D is the body-bar, provided with a cross-, head, d, by which it issuspended from and is adaptedto slide upon cross-bar B. VThis movementis accomplished by means of the feedscrew C, as I shall hereinafterexplain.

'Mounted in the lower endlof the body-bar D is the driving-shaft H, towhich power is to be applied in suitable manner, as by the pulley h.Upon this shaft is an eccentric or cam, G, which, through anintermediatecushion, y,

and bearing Y', is adapted 'to-force back the hammer-holder I, intowhich the handle' j of hammer J is inserted. f The holder is held to itsaction with the eccentric vby means of the arm Y, pivoted rod Z, andspring K. These devices result in the yibration of the hammer to causeit to deliver its blow.

My first and main improvement relates tor the manner in which thedrill-bit is connected with the machine and receives the blow of thehammer.

An arbor is usually fitted into aseat in the machine, and the blowdelivered mustbe communicated through it and the chuck to the drill-bit.The weight ofthe arbor and chuck is generally about four or ve times theweight of the drill-bit, and I have found that a large percentage of thepower applied to themachine is lost, as a great portion of the force ofthe blow is expended in overcoming the inertia of the drill arbor andchuck.

The object of my first improvement is to do away with the arbor, steelpin, and chuck through which the blow is communicated,l and to strikedirectly on the end of the drill-bit, whereby a much lighter blow willperform the same actual work, and this, of course, means the exercise ofless power in operating the machine. In accomplishing-this object, ofstriking directly upon the head of the drill-bit certain necessitiesofthe case mustbeconsidered.- In the first place, means must be providedto hold the bit when in an inclined position, then the drill-bit, beinglight, will rebound considerably from the rock, and there-` fore I mustprovide some means for controlling its rebound and for returning andholding it against the bottom of the rock to receive the next blow, andthese means must also be adapted to move on the bit in order that thelatter may advance into the hole as it deepens and that the hammer'maybe moved up to the drill-bit. In the next place, means must be providedfor rotating lthe drill which will also permit its line motion.Accordingly Ihave the following mechanism:

In the cross-head d is loosely seated,in line with the hammer, a hollowarbor, M,which is adapted to revolve freely in its seat and to have aslight line movement, Fig. 2. The

. hollow center of the arbor is larger in diameter than the drill-bit N,which passes through it, in order to allow said bit to be drawn out whennecessary, notwithstanding its possiblybattered head. The forwardportion of the theA drill-bit.

hollow center of the arbor is turned out to an increased diameter, andin this portion is fitted an annular elastic clamp or cushion, O,preferably a piece of rubber hose embracing One en d of this cushionabuts against. the shoulder formed by the increased center, asdescribed, while against its other end the end of an annular gland ornut, P,

bears. This gland is externally threaded, while the hole into which itfits is'internally threaded, so that said gland can readily be screwedin against the cushion to compress it andr tighten itv on the drill-bit.The outer surface of the forward end of the arbor is threaded to receivea ring, (Ow-between which and the forward end of the arbor-seat in thecross-head d is a spring, B, preferably an annular band of rubber. Therear end of the drill-bit, which is tempered to prevent its beingbattered, projects behind the arbor, and is adapted to receive the blowsof the hammer J. The effect of the blow direct on the head of thedrill-bit is to drive itforward in the arbor and in the clamping-cushionO. Its rebound is received and broken by said cushion.` By means of thegland l? the tension of the cushion on the drill-bit is so adj ustedthat the rebound of the drill-bit is communicated through said cushionto the whole arbor, which moves back slightly, the outer spring, R,yielding to it momentarily, and then forcing it forward again to throwthe drill up against the bottom of the hole, ready to receive the nextblow. The tension of the cushion O is, however, not great` enough toprevent the advance of the drill under the blows it receives, nor greatenough, in fact, to make the friction of any importance at all, comparedwith the advantage of obviating the use of the ordinary reciprocatingdrill-spindle or arbor and chuck; and the whole machine may, by means ofthe screw C, be moved up on the drill-bit as the latter advances andwithout stopping its operation. The rear portion of the arbor M is cutout to form a rectangular inwardly-t-apering socket, in which socket.

the two-,part tapering chuck S fitsfFig. 2. This chuck consists vof two.equal plates, in which are made angular grooves conforming to theangular exterior of the drill-bit upon which the said plates fit, Fig.6. The chuck at itsv inner end abuts against a Washer, s, preferably-anelastic one, in the base of the A perforated screw-cap, T, fits over therear end of the arbor and presses up against and holds the chuck, Figs.1, 2. The cap has preferably a thin elastic washer on its inner surfacewhich tightens it to its place when screwed up. This cap adjusts thechuck with sufficient pressure on the drill-bit to cause the rotation ofthe latter with it, and yet permit its line movement. As the chuckbecomes worn ythe washer s is thinned down and the chuckis pushedfarther in, its tapering shape and seat causing it to adjust itselfproperly;'or by making the washer elastic it will yield to theadjustment ofthe chuck. By fitting in a rectangular seat the chuck is ofcourse rotated by the arbor. This rotation of the arbor is effected bymeans of the endless chain U, passing over a chain-pulley, u, on thearbor. The chain below passes around a pulley, o, operated by a wormgear, W, meshing with a worm (not here shown) on the driving-shaft H.

In machineswhere the drill-bit is long, or where it is working in rockin which it has a tendency to run to one side by reason of the seams orhard or uneven spots in the rock, I find it necessary to duplicate aportion of the devices I have described for the forward portion of thedrillbit. This I showin Figs. 3, 4:, 5. From the forward end of thecross-bar B extends an arm, X, having a semicircular groove in it. Tothe endof this arm is hinged a swinging cap, X", 'havingacorrespondinggroove in it, which with the other groove, forms the bearing or seat forthe arbor M. The general construction of this arbor and its appendagesare similar to those previously described, omitting, however, the chuckand rotating devices, and are designated by similar letters. By throwingback the cap X the arbor may readily belifted out. The feed-screw Cpasses through a nut, c, secured to the crosshead d of the body-bar D.Now, if this nut were permanently secured to the crosshead, the body-lbar could be moved back to withdraw the drill-bit from the hole only bythe operation of the screw, which would be a slow and tedious process.To obviate this I provide for the ready disengagement of the nut,whereby the body-bar may be moved back rapidly on the cross-bar. This isdone by means of an' arm, d, extending forwardly from the crosshead,passing through the body of the nut c, and slotted to receive across-pin,o, whereby it is held with the nut. By removing the pin thecrosshead is freed from the nut and the whole body-bar may be moved backwith ease.

Having thus describedl myvinvention, what I claim as new, and desire tosecure by Letters- IIO 1. In a machine rock-drill in which the drillbitis driven by a blow delivered directly upon its head, a drill-containingarbor seated in the frame or body of the machine, and adapted to have aline movement therein, an elastic cushion or clamp within the arbor andembracing the drill-bit, a screw-gland for tightening the cushion on thedrill-bit, and an elastic cushion or spring between the front of thearbor and the frame of the machine, substantially as herein described.

2. In a machine rock-drill in which the drillbit is driven by a blowdelivered directly upon its head, a rotating hollow drill-containingarbor seated in the frame or body of the machine, and a two-parttapering chuck in the rear end of the arbor and embracing the rear ofthe drill-bit, substantially as decribed.

3. In a machine rock-drill having a mechanism for delivering a blow, thehollow arbor M, seated within the frame or body of the machine in linewith the blow-delivering mechanism, and the drill-bit N, seated in saidarbor and adapted to receive the blow directly upon its head, anda'cushion,O, and chuck S, located within the arbor at opposite ends,substantially as herein described.

4. In a machine rock-drill in which the drill-bit is driven by a blowdelivered directly or elastic cushion or clamp O, seated in its forwardend and embracing the drill, and the screwgland P, by which it iscompressed upon the drill-bit, substantially as herein described.

5. In a machine rock-drill having a mechanism for delivering ablow, thehollow arbor M, through which the drill-bit passes, having a rectangulartapering socket in its rear end, the two part tapering chuck S, fittingin said socket and embracing land engaging the drillbit to effect itsrotation, the perforated screwcap T, and means for rotating said arbor,in cambination with the drill-bit N, adapted to receive the blowdirectly upon its rear end, substantially as herein described.

6. In a machine rock-drill having a mechanism for delivering a blow, thehollow arbor M, through which the drill-bit passes, having a rectangulartapering socket in its rear end,

with an elastic washer, s, at its base, the twopart tapering chuck S,fitting in said socket and embracing and engaging the drill-bit, theperforated screw-cap T, and means for rotating the arbor, consisting ofthe chain-pulley u, endless chain U, and means for driving it,substantially as described, in combination with the drill-bit N, adaptedto receive the blow directly upon its rear end, substantially as hereindescribed. l

7. In a machine rock-drill having a mechanism for delivering a blow, thehollow arbor M, seated in the frame or body of the machine and adaptedto have a line and arotary movement therein, the screw-band Qon itsforward end, and the spring or elastic band or packingR,wherebythelinemovement is controlled,

the annular elastic clamp or band O, seatedin the forward end of thearbor, and the screwgland P, by which it is compressed upon thedrill-bit, the chuck S, seated in the rear of the arbor and engaging thedrill-bit, theperforated screw-cap T, and means for rotating the arbor,all arranged as herein described, in combination with the drill-bit N,adapted to receive the blow directly upon its head, substantially asherein described.

8. In a machine rock-drill having a mechanism for delivering a blow, thecross-bar B and sliding body-bar D, and the arbors M, seated in suitablebearings, one on said cross-'bar at `its forward end and the other onthe bodybar, said arbors having the clamping-cushions O and thespring-cushions R', substantially -as herein described, in combinationwith the drillbit N, passing through said arbors and adapted to receivethe blow directly upon its head, substantially as herein described.

9. In a machine rock-drill, the cross-bar B,

feed-screw C, and nutc on said screw, in combination with the body-barD, carrying the drill-bit and driving mechanism, said bar having aslotted arm, d, passing through the nut and confined by a removable pin,c', substantially as and for the purpose herein described.

In witness whereof I have hereunto set my hand.

CHARLES O. BARLOW.

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